In Windsurf Magazine I have noted that in some of the photos of wave sailors, they detail the wind speed plus sail and board sizes. For example, wind - 10-12 knots and a X brand 5.6 sail on x brand board at 80 liters. I fail to see how these guys can get outside the surf line in such light winds, small sail/board and surf.

I have done a little surf sailing along the Texas gulf coast and know that it is impossible to do the above even if you only weigh 70 kg.